1 files changed, 80 insertions, 0 deletions

diff --git a/arch/arm64/kernel/entry-fpsimd.S b/arch/arm64/kernel/entry-fpsimd.S
new file mode 100644
index 00000000000..17988a6e7ea
--- /dev/null
+++ b/arch/arm64/kernel/entry-fpsimd.S
@@ -0,0 +1,80 @@
+/*
+ * FP/SIMD state saving and restoring
+ *
+ * Copyright (C) 2012 ARM Ltd.
+ * Author: Catalin Marinas <catalin.marinas@arm.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/linkage.h>
+
+#include <asm/assembler.h>
+
+/*
+ * Save the FP registers.
+ *
+ * x0 - pointer to struct fpsimd_state
+ */
+ENTRY(fpsimd_save_state)
+        stp     q0, q1, [x0, #16 * 0]
+        stp     q2, q3, [x0, #16 * 2]
+        stp     q4, q5, [x0, #16 * 4]
+        stp     q6, q7, [x0, #16 * 6]
+        stp     q8, q9, [x0, #16 * 8]
+        stp     q10, q11, [x0, #16 * 10]
+        stp     q12, q13, [x0, #16 * 12]
+        stp     q14, q15, [x0, #16 * 14]
+        stp     q16, q17, [x0, #16 * 16]
+        stp     q18, q19, [x0, #16 * 18]
+        stp     q20, q21, [x0, #16 * 20]
+        stp     q22, q23, [x0, #16 * 22]
+        stp     q24, q25, [x0, #16 * 24]
+        stp     q26, q27, [x0, #16 * 26]
+        stp     q28, q29, [x0, #16 * 28]
+        stp     q30, q31, [x0, #16 * 30]!
+        mrs     x8, fpsr
+        str     w8, [x0, #16 * 2]
+        mrs     x8, fpcr
+        str     w8, [x0, #16 * 2 + 4]
+        ret
+ENDPROC(fpsimd_save_state)
+
+/*
+ * Load the FP registers.
+ *
+ * x0 - pointer to struct fpsimd_state
+ */
+ENTRY(fpsimd_load_state)
+        ldp     q0, q1, [x0, #16 * 0]
+        ldp     q2, q3, [x0, #16 * 2]
+        ldp     q4, q5, [x0, #16 * 4]
+        ldp     q6, q7, [x0, #16 * 6]
+        ldp     q8, q9, [x0, #16 * 8]
+        ldp     q10, q11, [x0, #16 * 10]
+        ldp     q12, q13, [x0, #16 * 12]
+        ldp     q14, q15, [x0, #16 * 14]
+        ldp     q16, q17, [x0, #16 * 16]
+        ldp     q18, q19, [x0, #16 * 18]
+        ldp     q20, q21, [x0, #16 * 20]
+        ldp     q22, q23, [x0, #16 * 22]
+        ldp     q24, q25, [x0, #16 * 24]
+        ldp     q26, q27, [x0, #16 * 26]
+        ldp     q28, q29, [x0, #16 * 28]
+        ldp     q30, q31, [x0, #16 * 30]!
+        ldr     w8, [x0, #16 * 2]
+        ldr     w9, [x0, #16 * 2 + 4]
+        msr     fpsr, x8
+        msr     fpcr, x9
+        ret
+ENDPROC(fpsimd_load_state)